<template>
  <form-item-wrapper :designer="designer" :field="field" :rules="rules" :design-state="designState"
                     :parent-widget="parentWidget" :parent-list="parentList" :index-of-parent-list="indexOfParentList"
                     :sub-form-row-index="subFormRowIndex" :sub-form-col-index="subFormColIndex"
                     :sub-form-row-id="subFormRowId">
    <!-- el-upload增加:name="field.options.name"后，会导致又拍云上传失败！故删除之！！ -->
    <el-upload ref="fieldEditor" :disabled="field.options.disabled"
               :style="styleVariables" class="dynamicPseudoAfter"
               :action="realUploadURL" :headers="uploadHeaders" :data="uploadData"
               :with-credentials="field.options.withCredentials"
               :multiple="field.options.multipleSelect" :file-list="fileList"
               :show-file-list="field.options.showFileList" :class="{'hideUploadDiv': uploadBtnHidden}"
               :limit="field.options.limit" :on-exceed="handleFileExceed" :before-upload="beforeFileUpload"
               :on-success="handleFileUpload" :on-error="handleUploadError">
      <template #tip>
        <div class="el-upload__tip"
             v-if="!!field.options.uploadTip">{{ field.options.uploadTip }}
        </div>
      </template>
      <template #default>
        <svg-icon icon-class="el-plus"/>
        <i class="el-icon-plus avatar-uploader-icon"></i>
      </template>
      <template #file="{ file }">
        <div class="upload-file-list">
          <span class="upload-file-name" :title="file.name">{{ file.name }}</span>
          <a :href="file.url" download="" target="_blank">
            <span class="el-icon-download file-action" :title="i18nt('render.hint.downloadFile')">
              <svg-icon icon-class="el-download"/>
            </span></a>
          <span class="file-action" :title="i18nt('render.hint.removeFile')" v-if="!field.options.disabled"
                @click="removeUploadFile(file.name, file.url, file.uid)"><svg-icon icon-class="el-delete"/></span>
        </div>
      </template>
    </el-upload>
  </form-item-wrapper>
</template>

<script>
import FormItemWrapper from './form-item-wrapper.vue'
import emitter from '@/utils/designer/emitter'
import i18n, {translate} from "@/utils/vue-i18n/i18n";
import {
  deepClone,
  evalFn
} from "@/utils/designer/util"
import fieldMixin from "../fieldMixin";
import SvgIcon from '@/components/public/svg-icon'

let selectFileText = "'" + translate('render.hint.selectFile') + "'"

export default {
  name: "file-upload-widget",
  componentName: 'FieldWidget',  //必须固定为FieldWidget，用于接收父级组件的broadcast事件
  mixins: [emitter, fieldMixin, i18n],
  props: {
    field: Object,
    parentWidget: Object,
    parentList: Array,
    indexOfParentList: Number,
    designer: Object,

    designState: {
      type: Boolean,
      default: false
    },

    subFormRowIndex: { /* 子表单组件行索引，从0开始计数 */
      type: Number,
      default: -1
    },
    subFormColIndex: { /* 子表单组件列索引，从0开始计数 */
      type: Number,
      default: -1
    },
    subFormRowId: { /* 子表单组件行Id，唯一id且不可变 */
      type: String,
      default: ''
    },

  },
  components: {
    SvgIcon,
    FormItemWrapper,
  },
  data() {
    return {
      oldFieldValue: null, //field组件change之前的值
      fieldModel: [],
      rules: [],

      uploadHeaders: {},
      uploadData: {
        key: '',  //七牛云上传文件名
        //token: '',  //七牛云上传token

        //policy: '',  //又拍云上传policy
        //authorization: '',  //又拍云上传签名
      },
      fileList: [],  //上传文件列表
      uploadBtnHidden: false,

      styleVariables: {
        '--select-file-action': selectFileText,
      },
    }
  },
  computed: {
    realUploadURL() {
      let uploadURL = this.field.options.uploadURL
      if (!!uploadURL && ((uploadURL.indexOf('DSV.') > -1) || (uploadURL.indexOf('DSV[') > -1))) {
        let DSV = this.getGlobalDsv()
        console.log('test DSV: ', DSV)  //防止DSV被打包工具优化！！！
        return evalFn(this.field.options.uploadURL, DSV)
      }

      return this.field.options.uploadURL
    },

  },
  beforeCreate() {
    /* 这里不能访问方法和属性！！ */
  },

  created() {
    /* 注意：子组件mounted在父组件created之后、父组件mounted之前触发，故子组件mounted需要用到的prop
       需要在父组件created中初始化！！ */
    this.initFieldModel()
    this.registerToRefList()
    this.initEventHandler()
    this.buildFieldRules()

    this.handleOnCreated()
  },

  mounted() {
    this.handleOnMounted()
  },

  beforeUnmount() {
    this.unregisterFromRefList()
  },

  methods: {
    handleFileExceed() {
      let uploadLimit = this.field.options.limit
      this.$message.warning(this.i18nt('render.hint.uploadExceed').replace('${uploadLimit}', uploadLimit))
    },

    beforeFileUpload(file) {
      let fileTypeCheckResult = false
      let extFileName = file.name.substring(file.name.lastIndexOf('.') + 1)
      if (!!this.field.options && !!this.field.options.fileTypes) {
        let uploadFileTypes = this.field.options.fileTypes
        if (uploadFileTypes.length > 0) {
          fileTypeCheckResult = uploadFileTypes.some((ft) => {
            return extFileName.toLowerCase() === ft.toLowerCase()
          })
        }
      }
      if (!fileTypeCheckResult) {
        this.$message.error(this.i18nt('render.hint.unsupportedFileType') + extFileName)
        return false;
      }

      let fileSizeCheckResult = false
      let uploadFileMaxSize = 5  //5MB
      if (!!this.field.options && !!this.field.options.fileMaxSize) {
        uploadFileMaxSize = this.field.options.fileMaxSize
      }
      fileSizeCheckResult = file.size / 1024 / 1024 <= uploadFileMaxSize
      if (!fileSizeCheckResult) {
        this.$message.error(this.i18nt('render.hint.fileSizeExceed') + uploadFileMaxSize + 'MB')
        return false;
      }

      this.uploadData.key = file.name
      return this.handleOnBeforeUpload(file)
    },

    handleOnBeforeUpload(file) {
      if (!!this.field.options.onBeforeUpload) {
        let bfFunc = new Function('file', this.field.options.onBeforeUpload)
        let result = bfFunc.call(this, file)
        if (typeof result === 'boolean') {
          return result
        } else {
          return true
        }
      }

      return true
    },

    updateFieldModelAndEmitDataChangeForUpload(fileList, customResult, defaultResult) {
      let oldValue = deepClone(this.fieldModel)
      if (!!customResult && !!customResult.name && !!customResult.url) {
        this.fieldModel.push({
          name: customResult.name,
          url: customResult.url
        })
      } else if (!!defaultResult && !!defaultResult.name && !!defaultResult.url) {
        this.fieldModel.push({
          name: defaultResult.name,
          url: defaultResult.url
        })
      } else {
        this.fieldModel = deepClone(fileList)
      }

      this.syncUpdateFormModel(this.fieldModel)
      this.emitFieldDataChange(this.fieldModel, oldValue)
    },

    handleFileUpload(res, file, fileList) {
      if (file.status === 'success') {
        let customResult = null
        if (!!this.field.options.onUploadSuccess) {
          let mountFunc = new Function('result', 'file', 'fileList', this.field.options.onUploadSuccess)
          customResult = mountFunc.call(this, res, file, fileList)
        }

        this.updateFieldModelAndEmitDataChangeForUpload(fileList, customResult, res)
        if (!!customResult && !!customResult.name) {
          file.name = customResult.name
        } else {
          file.name = file.name || res.name || res.fileName || res.filename
        }
        if (!!customResult && !!customResult.url) {
          file.url = customResult.url
        } else {
          file.url = file.url || res.url
        }
        this.fileList = deepClone(fileList)
        this.uploadBtnHidden = fileList.length >= this.field.options.limit
      }
    },

    updateFieldModelAndEmitDataChangeForRemove(deletedFileIdx, fileList) {
      let oldValue = deepClone(this.fieldModel)
      this.fieldModel.splice(deletedFileIdx, 1)
      this.syncUpdateFormModel(this.fieldModel)
      this.emitFieldDataChange(this.fieldModel, oldValue)
    },

    removeUploadFile(fileName, fileUrl, fileUid) {
      let foundIdx = -1
      let foundFile = null
      this.fileList.forEach((file, idx) => {
        if ((file.name === fileName) && ((file.url === fileUrl) || (!!fileUid && file.uid === fileUid))) {
          foundIdx = idx
          foundFile = file
        }
      })

      if (foundIdx >= 0) {
        this.fileList.splice(foundIdx, 1)
        this.updateFieldModelAndEmitDataChangeForRemove(foundIdx, this.fileList)
        this.uploadBtnHidden = this.fileList.length >= this.field.options.limit

        if (!!this.field.options.onFileRemove) {
          let customFn = new Function('file', 'fileList', this.field.options.onFileRemove)
          customFn.call(this, foundFile, this.fileList)
        }
      }
    },

    handleUploadError(err, file, fileList) {
      if (!!this.field.options.onUploadError) {
        let customFn = new Function('error', 'file', 'fileList', this.field.options.onUploadError)
        customFn.call(this, err, file, fileList)
      } else {
        this.$message({
          message: this.i18nt('render.hint.uploadError') + err,
          duration: 3000,
          type: 'error',
        })
      }
    },

  }
}
</script>


